I have a program that run in the terminal. But once in a while I need it
to bring up a window (GUI) with some information (and interactive
widgets).
So I do:
root = TkRoot.new
.....set up the window.....
Tk.mainloop
This works. Then the user closes the window and the program continues
running.
HOWEVER, the next time I try to bring up the window, Tk gives the
following error:
can't invoke "frame" command: application has been destroyed
(RuntimeError)
(I also tried with TkToplevel instead of TkRoot.)
How can I solve this problem?
I looked into the source code of '/ext/tk/lib/dialog.rb', thinking
perhaps TkDialog is what I need. I tried the following code:
class MyDialog < TkDialog
def initialize(*args)
super(*args)
TkLabel.new(self, :text => 'this is a test').pack
end
end
MyDialog.new :title => 'something'
Now, this is already an improvement because I can call MyDialog.new()
again and again without Tk telling me that the "application has been
destroyed". HOWEVER, I can't put my own widgets in the dialog: my 'this
is a test' label doesn't show up...
root = TkRoot.new
.....set up the window.....
Tk.mainloop
HOWEVER, the next time I try to bring up the window, Tk gives the
following error:
can't invoke "frame" command: application has been destroyed
(RuntimeError)
Now here's a blast from the past:
def maybeMainloop(reveal = false)
if reveal then
Tk.mainloop()
Tk.restart() @canvas = nil
end
end
Notice I was using 4-space indentations back then! Always remember that following community standards, such as Ruby's Official 2-space indentations, is much MUCH more important than producing lots of boring original research!
I have a program that run in the terminal. But once in a while I need it
to bring up a window (GUI) with some information (and interactive
widgets).
So I do:
root = TkRoot.new
.....set up the window.....
Tk.mainloop
This works. Then the user closes the window and the program continues
running.
HOWEVER, the next time I try to bring up the window, Tk gives the
following error:
can't invoke "frame" command: application has been destroyed
(RuntimeError)
(I also tried with TkToplevel instead of TkRoot.)
How can I solve this problem?
I looked into the source code of '/ext/tk/lib/dialog.rb', thinking
perhaps TkDialog is what I need. I tried the following code:
class MyDialog < TkDialog
def initialize(*args)
super(*args)
TkLabel.new(self, :text => 'this is a test').pack
end
end
MyDialog.new :title => 'something'
Now, this is already an improvement because I can call MyDialog.new()
again and again without Tk telling me that the "application has been
destroyed". HOWEVER, I can't put my own widgets in the dialog: my 'this
is a test' label doesn't show up...
Cheat, override the 'close' button and make it hide the window instead?
(BTW, suppose I'll be running my code inside a Tk application. In that
case I wouldn't want to execute Tk.mainloop() (and restart(), of course)
at all. Any way to find out if we're already running in a Tk
application?)
Notice I was using 4-space indentations [...]
LOL
Hidetoshi NAGAI wrote:
There is a trick
[...]
@v.wait # wait command makes a eventloop while waiting
Thanks, Nagai, but this is too much voodoo for me I don't bother to
study the "dark" corners of Tk because I have a feeling Tk is a
dead-end. (It has an ingeniously simple API, I admit, but the facts that
I struggled yesterday to fetch the selcted item from a TkListbox, and
even more to add scrollbars, and that the fonts are so ugly and
unreadable, show that Tk has been dormant for at least 15 years.) But it
seems we don't have much choice. GTK requires you to memorize CONSTANTS.
Shoes doesn't have mature widgets. FOX is a pain to compile. So we go
with Tk.
Read and obey the post by Hidetoshi NAGAI. He maintains RubyTk, AFAIK!
(BTW, suppose I'll be running my code inside a Tk application. In that case I wouldn't want to execute Tk.mainloop() (and restart(), of course) at all. Any way to find out if we're already running in a Tk application?)
If a GUI is already running, then if you block its main loop, the user will see the window lock up. So use @v.wait...
GTK requires you to memorize CONSTANTS. Shoes doesn't have mature widgets. FOX is a pain to compile. So we go with Tk.
dead-end. (It has an ingeniously simple API, I admit, but the facts that
I struggled yesterday to fetch the selcted item from a TkListbox, and
even more to add scrollbars,
Hmm... I think that it not so difficult.
Possibly, Ruby/Tk is easier than Tcl/Tk.
···
From: Albert Schlef <albertschlef@gmail.com>
Subject: Re: A Tk window
Date: Wed, 4 Feb 2009 22:40:16 +0900
-------------------------------------------------------------------
require 'tk'
f = TkFrame.new.pack(:expand=>true, :fill=>:both)
lbox = TkListbox.new(f)
lbox.yscrollbar(TkScrollbar.new(f).pack(:side=>:right, :fill=>:y))
lbox.pack(:side=>:right, :expand=>true, :fill=>:both)
lbox.bind('<ListboxSelect>', :widget){|w|
# :widget equal to "%W" (see Tcl/Tk's "bind" manual).
# current Ruby/Tk supports accessor-names of Tk::Event object instead of
# "%" substitutions.
p [w.curselection, w.get(w.curselection[0])]
}
lbox.value = %w(a b c foo bar baz hoge fuga zzz asdf qwer zxcv)
lbox.focus
and that the fonts are so ugly and
unreadable, show that Tk has been dormant for at least 15 years.)
Well, I recommend you to use Tcl/Tk8.5 for your Ruby/Tk.
Tcl/Tk8.5 supports anti-aliased fonts on X window systems,
and includes Tile (Ttk) extension (widget styling engine) as default.
--
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
As the author of the www.tkdocs.com site, I'd very much welcome any
feedback as to the installation instructions, and particularly if anyone
knows easier ways to get things running!
Mark
···
Albert Schlef <albertschlef@gmail.com> wrote:
>> What does this entail? Will I have to compile Tcl/Tk/Ruby myself?
> Nevermind, I've found instructions, here:
> TkDocs Tutorial - Installing Tk
I gave up, it's too complicated for me. I'll just wait for the next
release of Ubuntu.
>> (Why do I get the impression that "The Tk Way" equals "Nothing works out
>> of the box"?)
>
> It's not true for Tk but I agree the **Ruby/Tk** is difficult to make
> working only because Tk is not part of Ruby.
I gave up, it's too complicated for me. I'll just wait for the next
release of Ubuntu.
Did you see '<ruby-src-tree>/ext/tk/README.tcltklib' ?
Can't it help you ?
Thanks! I made it. It was actually simple. My Tk apps look decent now
Mark Roseman wrote:
As the author of the www.tkdocs.com site, I'd very much
welcome any feedback as to the installation instructions
Two things:
1. There's no need to compile the whole Ruby. After I extracted Ruby's
source tarball I went to the 'ext/tk' folder and compiled only the Tk
extension. As Nagai points out, that folder has a README.tcltklib which
lists the command line options one needs to pass to 'ruby extconf.rb'.
2. There's no need to mention ActiveState or ActiveTcl. On my linux
distro (Ubuntu) I just type "sudo apt-get install tcl8.5 tcl8.5-dev
tk8.5 tk8.5-dev" and everything gets installed.
2. There's no need to mention ActiveState or ActiveTcl. On my linux
distro (Ubuntu) I just type "sudo apt-get install tcl8.5 tcl8.5-dev
tk8.5 tk8.5-dev" and everything gets installed.
Except useful Tcl/Tk extensions.
···
From: Albert Schlef <albertschlef@gmail.com>
Subject: Re: A Tk window
Date: Sun, 8 Feb 2009 08:48:04 +0900
--
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
I don't bother to